J/ApJ/664/458ivo://CDS.VizieR/J/ApJ/664/458doi:10.26093/cds/vizier.16640458CDSDevi A.S.Misra R.Agrawal V.K.Singh K.Y.2017-06-01T08:52:14Z2009-10-29T12:43:06ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesx-ray-sourcesastronomical-modelsData from Chandra observations of 30 nearby galaxies were analyzed and 365 X-ray point sources were chosen whose spectra were not contaminated by excessive diffuse emission and not affected by photon pileup. The spectra of these sources were fitted using two spectral models (an absorbed power-law and a disk blackbody) to ascertain the dependence of estimated parameters on the spectral model used. It was found that the cumulative luminosity function depends on the choice of the spectral model, especially for luminosities >10^40^ergs/s. A large number (~80) of the sources have luminosities >10^39^ergs/s (ultraluminous X-ray sources) with indistinguishable average spectral parameters (inner disk temperature ~1keV and/or photon index GAMMA~2) with those of the lower luminosity ones.2007ApJ...664..458Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/664/458CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/664/458https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/664/458http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/664/458https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/664/458https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/664/458http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/664/458GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/664/458/table1 (Sample galaxy properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/664/458/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/664/458/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/664/458/table1?GETtext/xml+votable180.050000true11.8880417-25.28827780.005555555555555556Cone search capability for table J/ApJ/664/458/Xsources (Spectral fit of X-ray sources with power-law and blackbody disk models)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/664/458/Xsources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/664/458/Xsources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/664/458/Xsources?GETtext/xml+votable180.050000true11.9294583-25.25813330.005555555555555556Cone search capability for table J/ApJ/664/458/table2 (List of sources with count rate > 0.05counts/s)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/664/458/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/664/458/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/664/458/table2?GETtext/xml+votable180.050000true11.887375-25.29688890.0055555555555555566/2409 3389 5995 6081 7424 7606 7743 8203 8225 10761 10841 10905 10911 11027 11262 11263 11434 15592 15593 16655 16666 18398 25083 26125 27515 27718 27773 27907 27914 28184 28496 34471 34492 34493 34494 34534 34535 43262https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/664/458?format=asciiX-raydefaultJ/ApJ/664/458/table1Sample galaxy propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyGalaxy namemeta.id;meta.maincharprimaryn_GalaxySimbad column added by the CDSmeta.ref.urlcharGal2Associated galaxymeta.id.assoccharDistDistanceMpcpos.distance;pos.galactocentricfloatObsIDChandra observation IDmeta.id;obsintTexpExposure timekstime.duration;obs.exposurefloatNNumber of point sources with total counts from the source >=60, as detected by wavdetect with fluxscale=1meta.numberintSimbadSimbad column added by the CDScharNEDSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/664/458/XsourcesSpectral fit of X-ray sources with power-law and blackbody disk modelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyGalaxy namemeta.id.parentcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainnHplEquivalent H column density (power-law)1e+22cm**-2phys.columnDensityfloatE_nHplUpper limit uncertainty in nHpl1e+22cm**-2stat.error;stat.maxfloate_nHplLower limit uncertainty in nHpl1e+22cm**-2stat.errorfloatGammaPhoton power-law indexmeta.code;spect.indexfloatE_GammaUpper limit uncertainty in Gammastat.error;stat.maxfloate_GammaLower limit uncertainty in Gammastat.errorfloatlogLpl0.3-8keV luminosity in erg/s (power-law)log(1e-07W)phys.luminosity;em.X-rayfloatE_logLplUpper limit uncertainty in logLpllog(1e-07W)stat.error;stat.maxfloate_logLplLower limit uncertainty in logLpllog(1e-07W)stat.errorfloatCst.plC-statistic result in power-law model (G1)stat.fit.paramfloatdof.plDegree of freedom in power-lawstat.fit.dofintnHbbEquivalent H column density (blackbody)1e+22cm**-2phys.columnDensityfloatE_nHbbUpper limit uncertainty in nHbb1e+22cm**-2stat.error;stat.maxfloate_nHbbLower limit uncertainty in nHbb1e+22cm**-2stat.errorfloatkTInner disk temperaturekeVphys.temperaturefloatE_kTUpper limit uncertainty in kTkeVstat.error;stat.maxfloate_kTLower limit uncertainty in kTkeVstat.error;phys.energyfloatlogLbbBolometric X-ray luminosity erg/s (blackbody)log(1e-07W)phys.luminosity;em.X-rayfloatE_logLbbUpper limit uncertainty in logLlog(1e-07W)stat.error;stat.maxfloate_logLbbLower limit uncertainty in logLlog(1e-07W)stat.errorfloatCst.bbC-statistic result in blackbody model (G1)stat.fit.paramfloatdof.bbDegree of freedom in blackbody modelstat.fit.dofintJ/ApJ/664/458/table2List of sources with count rate > 0.05counts/srecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyGalaxy namemeta.id.parentcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainCRCount ratect/sphot.count;em.X-raydouble